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We have investigated the isothermal phase diagram of the Ga­Ru­Cu ternary system at 1073K by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy to determine whether the stable icosahedral quasicrystal (i-phase) forms, as it does in the similar Al­Ru­Cu system, and new intermetallic phases exist. This is the first systematic investigation of the Ga­Ru­Cu system. No stable i-phase is identified in the Ga­Ru­Cu alloy system. However, we found a new ternary ( ̧) phase in the Ga­Ru­Cu system, which is characterized as a C-centered orthorhombic lattice with a ̧ = 11.80¡, b ̧ = 6.04¡, and c ̧ = 3.07¡. The (ideal) chemical composition of the ̧-phase is Ga50Ru37.5Cu12.5 (Ga4Ru3Cu). This new phase is stable up to 1073K. Above 1173K, the ̧-phase transforms to the cubic GaRu (¢) phase without any secondary phases. Thus, there is an order­disorder transition between the low-temperature ̧-phase and the high-temperature cubic ¢-phase in this temperature range. [doi:10.2320/matertrans.MBW201706]

materials transactions

Isothermal Section of Ga–Ru–Cu Ternary Phase Diagram at 1073 K: Formation of New Ternary Phase, Ga&lt;sub&gt;4&lt;/sub&gt;Ru&lt;sub&gt;3&lt;/sub&gt;Cu, and Its Structural Relation with the GaRu β-Phase